Mechanism for removing burs.



l. w. ATCHISON & F. M. STEIMER.

MECHANISM FOR REMOVING B URS.

APPLICATION FILED NOV 24. I9l?- 1,296,1 54. Ptented Mar. 4,19

3 2 SHEETSSHEET 2. w I 26 75 ISAAC W. ATCHISON, 0F CICERO, AND FREDERICK M. STEIMER, OF CHICAGO, ILLINOIS;

ASSIGNORS T0 WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. 1.,

A CORPORATION OF NEW YORK.

MECHANISM- FOR REMOVING BUR S.

Patented Mar. 4, 1919.

Application filed November 24, 1917. Serial No. 203,774.

T 0 all whom it may concern Be it, known that we, IsAAo W. Arcnrson and F EDERICK. M. STEIMER, citizens of the United States, residing at Cicero, in the county of Cook and State'of Illinois,'and

Chicago, in the county of Cook and State of Illinois, respectively, have invented certain new and useful Improvements in Mechanism for Removing Burs, of which the following is a full, clear, concise, and exact de- I scr-iption.

This invention relates to a mechanism for removing burs, and more particularly to a bur removing mechanism applicable for use witha thread rolling machine whereby the operation of rolling the thread on the blank and removing the burs from the blank are performed simultaneously,

A rather frequent incident Y facture of screw blanks is the production of burs and fins on the screw heads of the blanks. These burs and fins are objectionable and must be removed from the screw head's whenever the completedscrews are to tional burs are produced in the slotting opbe used for the more finished and better grades of work. Consequently it has been;

necessary to submit such screw blanks to a burring. operation after the .screw blanks havebeen completely formed and-finished. In the manufacture of slotted screws addieration at the point where the slotting saw leaves the screw head. This invention is therefore'not limited for use with a thread but may be used 1n combiother mechanism-which generates burs on the articles operated upon, which burs must be removed.

It is the object of this invention to. comhim the operation of thread rolling, or any other equivalent operation,-and blank bur- 'ring, the preferred form of the invention herein illustrated and described residing in the production of an improved attachment applicable to a thread rolling machine which will automatically remove the fins or burs attached to the heads of, the screw blanks as. said blanks are rolled between the thread rolling dies.

The invention is illustrated in the accompanying drawings, in which:

Figure 1 is aplan view. of a. portion of a thread rolling machine and shows the stain the manuof the. attachment shown in Fig. 5 showing the cutting edges or teeth thereof;

Fig. 7 is a section similar to Fig. 3 showing the alternative form of burring attachment illustrated in Fig. 5 secured to the machine, and

Figs. 8, 9, 10, and 11 are samples of screw blanks and illustrate the type of burs and fins produced on these blanks in the forming and slotting operations.

In the preferred form of the invention: illustrated in the figures, the apparatus has been adjusted for the burring operation on flat headed screws such as illustrated in Fig. 8. The burring attachment may be readily adjusted, however, for burring operations on screw blanks of any type, as for example,

those illustrated in Figs. 9 to 11 inclusive, as

will be hereinafter described.

For the purpose of illustrating this in vention, any type of standard thread rolling machine can be used, to any of which the burring mechanism may be readily attached;

In Figs. 1, 2, 3, 4. and 7 a section of a thread rolling machine including a stationary die 10 and a' movable die 11 has been shown. The stationary die 10 is suitably mounted inthe frame of'the machine 12,

and the movable die 11 arranged to be reciprocated on any type of suitable slide.

The screw blanks 13 are fed from any suitable hopper mechanism down the slide 14:,

from which they are delivered one. at a time to a position between the stationary and movable dies 10 and 11 respectively.

The preferred form of burring attach ment as illustrated in Figs. 1 to 4 inclusive consists of a bracket 15 which is secured to the bed 12 of the machine by means of the screws 16 and 17. A block 18 ispivotally secured by means of-the screw 19 to a down wardly extending arm 20 of the bracket 15. This block 18 is provided with a perforation 21 in whichis placed a tegral with a file, .22, said file being so located that it rests along the upper surface g, of the movable die 11. Any suitable scraper or abrading surface may be used in place of the file 22, but the bestresultswill be-obdies 10 and 11, willshave the burs from the head of the screw in adownward direction 7 and this will eliminate any tendency to throw the bur back into the slot of the screw. A file or scraper of the type illustrated in 7 Figs. 1' to 4 respectively will also avoid trouble which might-otherwise be caused by the burring chips which might clog and fill up the grooves between th cutting edges or teeth of the file.

Secured to the downwardly extending arm 20 of the bracket 15 is a spring 24, the lower end of which forces the file, scraper,-or other abrading surface 22 out over the top of the movable die 11 and about the pivotal center of the block 18. The file, scraper, or abrading surface 22 is held. in position in-the block 18 by means of the set screw 25, said set screw when loosened permitting rotation of the file in the block whereby the file can be adjusted to conform to the shape of the circumferential surface'of any of the heads of the screws'shown in Figs. 8 to 11 inclusive. The relative position of the scra er or file 22 with respect to the movable be determined vertically by, shifting the bracket 15, up or down on the bed 12 of the machine, the slots for the holding screws 16 and 17 in the bracket 15 being elongated, as indicated in Fig. 3. The bracket may be 'adjusted longitudinally-that is, the file or scraper 22 may be moved in toward the movable die 11 by placing suitable spacing plates between the mounting plate 26 of the bracket 15 and the frame 12 of the machine' For coarser burring or scraping operations a coarser scraping surface than that provided by the file 22, shown in Figs. 1 to 4 'inelusive, is required, and for these purposes a scraper such as shown in Figs. 5, 6, and 7 may be utilized. This scraper comprises a horizontal bracket 27 secured to the bed 12 of-the machine, which bracket is tappedito receive the screw 28. Mounted on the bracket 27 by means of the screw 28 is a plate 29 fitted with an elongated slot 30. A plate 31 is secured to the lower edge of the plate 29 by means of the screws 32 and 33. The plate 31, as indicated in Figs. 5-and 6, comprises a plurality of forwardly pro ecting teeth 34,

said teeth being given a taper when the projecting pin inie 11 can,

ncense scraper is to be used for scraping the burs from fiat headed screws, the angle ofsaid taper conforming to the angle of the cirthrough a slot in the bracket 27, thereby providing for longitudinal adjustment of the scraper. Vertical adjustment of the scraper is obtained by means of the screw 28 and the slotted perforations 30 in the plate 29.

In the operation of the machine, the screws are fed from the hopper down the guide 14, from which they are fed one at a time to the dies 10 and 11. In the use of the preferred form of scraper illustrated in F igsjl to 4, the file or scraping surface 22 is first adjusted by means of the set screw 25, so that the abrading surface or the file 22 conforms to the head of the screw on which threads are being rolled and which is to be barred. If the screw is of the flat headed. type, such as shown in Fig. '8 and which is illustrated in position in the machine-in Figs. 1 to 4: inclusive, the file is given an inclination such as shown particularly in.Fig. 3, after which the set screw 25 is driven home to hold the file in place. If the screws-which are being threaded are of the type shown in Figs. 9 to 11 inclusive,

the bracket 15 .is raised and the file or scraper 22 is turned so that its abrading surface is parallel to the faces of the dies'll and 10 andis likewise parallel to the fiat peripheral edge of the fillister headed screw illustratedin Fig. 9, the button headed screw illustrated in Fig. 10, and the specially de-. signed screw illustrated in Fig. 11. The screws illustrated in Fi s. 9 and 10 show the projecting burs 35 an I 36v which are ordinarily produced in the slotting operation.

. The screw blank shown. in Fig. 11 is formed in either a heading machine or a punch press, and in this operation it frequently c ours that a fin of the type 37 is formed on this head. This fin 37 is readily removed by the burring attachment when'the file or scraper 22 is adjusted to its vertical position. On the flat headed screws, such as illustrated in Fig. 8, a bur such as .38 is ordinarily generated in the slotting operation.

Returning now to the operation of the" mechanism when the file or scraper 22 has been adjusted to conform to the shape of the head of the screw on which the bur is located and which is to be removed. The machine is started and the movable die 11 will roll thescrews 13 forward between itand the the head of the screw,

stationary die 10. In this operation the movable die will carry the head of the screw 13 over the surface of the scraper or file and said scraper will cutoff or abrade the bur projecting from the head of the screw. The scraper 22 is held in close contact with which is being rolled, by the spring 24: which pushes the scraper about its pivot or screw 19 against the head of the screw that is being threaded. The scraper is consequently held in yielding contact with the. screw as it passes between the stationary and movable dies, and this yielding contact compensates for any commercial variations in the dimensions of the screws and also for slight variations in the relative positionsat which the screws are caught between the stationary die 10 and the movable die 11. It will be evident, therefore, that as the screws are threaded between the movable and stationary dies 11 and 10 respectively, the scraper or abrading surface 22 will remove from the heads of said screws any andall burs or fins formed thereon in the process of manufacturing the blanks, which burs may forming operation or in the slotting operation of the blank.

Obviously the invention is not limited to the specific embodiment thereof herein illustrated and described, but is capable of many variations and applications within the spirit and scope of the invention as the appended claims,

What is claimed is:

1. In a device of the character described,

in combination, a stationary die, a movable die operated to propel screws between said dies and roll threads thereon, and an adjustable abrading means located above said movable die said means serving to remove burs and fins from the heads of said screws.

2. In a combined thread rolling and burring machine, in combination, a machine be produced either in the i said dies and roll threads set forth in frame, a stationary die and a movable die mounted 1n said frame sald movable die being operable to propel screws between said dies and roll threads thereon, a mounting means secured to said frame, and an abrading means pivotally secured to sald mounting means and adapted to engage the headsmeans secured to said frame, an abrading' means plvotally secured to said mounting means and adapted to engage the heads of said screws as they are rolled betweensaid. dies to remove burs and fins therefrom, and means to adjust the angular position of said abrading means to conform to the shape of I the head of the screw.

, 4. In a device of the character described, in combination, a stationary die, a movable die operable to propel slotted screws between thereon, and an abrading means located above said movable die said abrading means having cutting surfaces angnlarly placed with respect to the slot in the screw.

5. In a device of the character described,

in combination, a stationary die, a movable die operable to propel slotted screws between said dies and roll threads thereon, and a pivoted file mounted above said movable die, the cutting edges or teeth'of said file being angularly placed with respect to the slot in said screw.

In witness whereof, we hereunto subscribe our names this-14th day of November, A. D., 1917.

ISAAC IV. ATCHISON. FREDERICK M. STIEIMER. 

